Which of the following options best describes the proper usage of MapReduce jobs in Hadoop
environments?

A.
MapReduce jobs are used to process vast amounts of data in-parallel on large clusters of
commodity hardware in a reliable, fault-tolerant manner.

B.
MapReduce jobs are used to process small amounts of data in-parallel on expensive hardware,
without fault-tolerance.

C.
MapReduce jobs are used to process structured data in sequence, with fault-tolerance.

D.
MapReduce jobs are used to execute sequential search outside the Hadoop environment using a
built-in UDF to access information stored in non-relational databases.